Lewis bush



(No Model.)

L. BUSH, Jr.

TOOL POR DRESSING EMEEY WHEELS.

No. 318,952. Patented June 2, 1885.

UNITED STATES PATENT L' P einen@ LEVIS BUSH, JR., OF CHICAGO, ILLINOiS,ASSIGNOR TO THE AMERICAN MACHINERY COMPANY, OF SAME PLACE.

TOOL FOR DRESSING ENlERY-WHEELS.

:SPECIFICATION forming part oi Letters Patent No. 318,952, dated June 2.1885.

(No model.)

To all whom. t may concern:

Be it known that I, Lnwrs BUSH, Jr., of Chicago, in the county of Cookand State of illinois, haveinvented certain new and useful Improvementsin Tools for Dressing Emery- XVheels; and I do hereby declare that thefollowing` is a full, clear, and exact description thereof, referencebeing had to the accompanying drawings, and to the letters of referencemarked thereon, which forni a part of this speciiication.

This invention relates to the class of devices for dressing emery-wheelswhich operate by means of a rotating part held in contact with the faceof the wheel to be dressed while said wheel isin motion.

`The object of the invention is to provide certain improvementscalculated to increase the efficiency, durability, and cheapness of thisclass ot' devices; and the invention consists in the matters hereinafterset forth, and pointed out in the claims.

In the accompanying drawings, Figure l is a perspective view of myimproved emerywheel dresser. Fig. 2 is a side elevation showing aportion of the headbroken away iu a central vertical section throughsaid head and the rotating cutter. Fig. 3 is au under side viewof thetool'. Fig. et is a transverse section in the axis of the rotatingcutter.

A is the handle or body of the tool, provided with a head having arecess, a, adapted to admit the rotating cutter B, which latter is heldremovably in place by means of a pin, C, journaled in pin or pivotsupports a', formed by the side walls ofthe recess c.. As hereshown, andas preferably constructed, the pin Cpasses through one of the supportsa', through the cutter, and into the opposite pin or pivot support ashort distance, but not entirely through the latter, and is held inplace by a laterally pivoted cap, C', adapted to swing out of the way toallow the pin C to be removed. The body A of the tool is provided with aprojection, d", on its upperside,whieh overhangs the cutter and isintended to intercept the particles thrown 0H from the emery-wheel inthe operation of the cutter.

The principalimprovement of my invention relates to the cutter B, whichin this case is a section of a screw cut oi' properlcngth to ent-erbetween the pivot-supports ct of the head or tool-body A, and which,after having the ribs or thread b cut thereon, may be hardened to anydesired degree, and inserted and held in the head by means of theremovable pin C.

In constructing cutters of the character herein shown a long rod ofsteel of proper diameter may have a continuous thread or series ofthreads, b, cut thereon by means of a lathe or other suitable device forthe purpose, and after thus making the thread the rod may be cut intosections B ofproper length and the holes drilled therein for thepivot-pin C, after which said sections may be suitably hardened. Thisconstruction of the cutter has the advantage of Working on a single axisparallel-With the face of the wheel to be dressed, and of at the sametime presenting a number of working-edges@ namely, the edges of theseries of spiral threads b-which have the desired Obliquity withreference to the face of the emery-wheel.

As another improvement in the devices shown, the shoulder b', located onthe under side of the tool-body, and which forms a rest or support whilethe tool is in operation bybeing brought to bear against a stationarypart ot' the machine containing the wheel to be dressed, has thetransversely curved form shown plainly in Fig. 3, adapting the tool tobe swayed from side to side whilebearing against said rest with greaterease on the part of the operator and regularity on the p art of the workperformed by the tool.

The projection ai overhanging the cutter, as shown, is also animprovement upon which I make claim, said projection serving tointercept the particles of emery thrown from the wheel in the operationof the cutter and preventing theirstrikingtheoperator. Thesmall hole ccontinued from the bottom of the recess c, which admits the inner end ofthe pin C, is to permit a wire or other similar article to be thrustagainst the pin C i'or the purpose of forcing the latter out of the headand cutter when it is desired to remove the said pin. The hole alsoaffords means for admitting oilto the pin, as does the smaller hole inthe cap C', by means of which latter the said cap may be rmly screwed upto its place and retained in position without being disturbed inapplying the oil to the adjacent end oi the pin.

IOO

I am aware that it is not new to form the eutter-shaft aperture entirelythrough the toolbody and to place caps over the ends of seid aperture inorder to retain the shaft in place, Wherefore this invention doesnotineludesueh construction.

I elimini as my inventionl. The combination, with a rotating cutter anda removable shaft or pivot-pin therefor, of a cutter holder or bodyprovided with pivot-pin supports, one of which is npertured to admit thefull size of the pin and provided with a retainingeap, and the oppositeone of which is recessed :it c on itsimiersurfaee to admit the end ofthepin and is provided'wth a small hole, c, extending from the reeessythrough the support, substantially as described.

